When choosing a decontamination site, the wind direction relative to the hot zone is described by which term?

• A. Downwind
• B. Crosswind
• C. Upwind
• D. Adjacent

Answer: (C)

Understanding wind direction in hazmat response hinges on whether you’re describing where the air is coming from or where it’s going. When you say the wind is upwind relative to the hot zone, you’re identifying the origin of the air in relation to the contaminated area—the wind is coming from that upwind direction toward the hot zone. This naming helps you infer how contaminants will move (they travel with the wind and carry debris or aerosols downwind). In contrast, downwind describes the direction toward which the air—and any contaminants—are moving, crosswind is wind coming from the side, and adjacent isn’t a wind-direction term. So the term describing the wind’s direction relative to the hot zone is upwind.